Brake booster issues 88 f250 7.3L
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This is what I would recommend. Mine got weak and was only pulling 15hg and it wasn't enough to keep up with my booster.
#6
while the gauge is a great idea ..... beware that you could also have a Vacuum leak and the pump could be just fine but not able to keep up with the leak, you need to Isolate the pump from the Vacuum systems to really test it, the POD should hold Vacuum after it stops running too.
#7
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#8
the POD is the Pump Diaphragm with check Valve assemblies not an Accumulator AKA Vacuum Tank.... but since you mention a "vacuum reservoir" it really wouldn't be a bad Idea to add one..... the best way to detect a Vacuum leak is with Helium, but I digress
Of course the Vacuum systems on our trucks are nothing more than a leak in the first place .... so is a moot point to think you could have no leak as it is harder to hold Vacuum than it is to hold Pressure.... and I doubt most DIY'ers will have a Vacuum leak detector and BTW a little shot of R134A and your AC leak detector could be used too
Of course the Vacuum systems on our trucks are nothing more than a leak in the first place .... so is a moot point to think you could have no leak as it is harder to hold Vacuum than it is to hold Pressure.... and I doubt most DIY'ers will have a Vacuum leak detector and BTW a little shot of R134A and your AC leak detector could be used too
#12
and the Vacuum Leaking Booster check valve I Posted wouldn't pose a real issue either, the booster would still work fine....recovery time might be a bit delayed is all.
my question to you is....... do you have a Hard Pedal or is the issue that the pedal goes to the floor board ? a failed booster generally leads to a Hard pedal
the only thing I can say is IF the booster has failed your brakes work like manual Brakes with no power assist
#14
the rod adjustment should be about 25 mm ..... and the advice of using a vacuum Gauge to see what your line vacuum is will help you
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I think it's time to add my Signature..........
My Standard Disclaimer as follows......................................
This information is provided free of charge and is probably worth precisely what you paid for it. If you build one of these devices, it is likely that it will fly apart and kill everyone within 5 blocks. Construct and use at your own risk.
#15
If the vacuum pump is shot you will have a hard pedal. When you shut off the truck and pump the pedal, it’s normal for a few pumps and then starts getting harder as you consume the remaining vacuum because the pump isn’t working.
If the booster is shot you will have a soft pedal like stepping on a plum. It will go down to the floor almost all the way before the truck decides it wants to stop. It is most noticeable going down a steep hill on the highway with your left turn at the bottom...
My master cylinder leaked into my booster causing the soft pedal no brake situation. To set the rod that goes into the master cylinder the instructions said to set it flush with the booster face. I didn’t do that cause it was easier to buy both assembled and install as one unit.
If the booster is shot you will have a soft pedal like stepping on a plum. It will go down to the floor almost all the way before the truck decides it wants to stop. It is most noticeable going down a steep hill on the highway with your left turn at the bottom...
My master cylinder leaked into my booster causing the soft pedal no brake situation. To set the rod that goes into the master cylinder the instructions said to set it flush with the booster face. I didn’t do that cause it was easier to buy both assembled and install as one unit.